Your muscules send messages to your brain through nervous system example when your injured
The inflammatory response can cause:
B. pain, swelling, and a local rise in temperature.
I think the circulatory system is the best body system because we need the heart to stay alive, many people live with only one lung. but we need the respiratory system to let oxygen in, and let carbon dioxide out.
False. Adolescents need the same amount of physical activity that adults do. The only thing that varies is the beneficial effects that exercise brings and the overall physical effect it has to the body. Adolescents still have a fast metabolism which enables them to maintain their shape despite the amount of caloric intakes they've had while adults don't. Exercise duration should at least last for 30 minutes to induce physical fitness in the body and this works for young adults and mature adults alike.